I really like the smallblock chinagirl, expansion chamber someday maybe. More midrange would be nice. I drafted a car and went 35 once, about 7K RPM, smooth. This bike is not pedal friendly tho. Will scrape or pogo with more than 10 degrees lean. Duck n go, kinda slow. Contrary to my usual fastidiousness, this bike only has a rear V-brake and the Shimano MegaRange is locked in 4th gear.